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alistair23-linux/net/ipv4/udp_diag.c
David Ahern 1801b570dd net: ipv6: add second dif to udp socket lookups 
Add a second device index, sdif, to udp socket lookups. sdif is the
index for ingress devices enslaved to an l3mdev. It allows the lookups
to consider the enslaved device as well as the L3 domain when searching
for a socket.

Early demux lookups are handled in the next patch as part of INET_MATCH
changes.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-07 11:39:22 -07:00

306 lines
7.5 KiB
C
Raw Blame History

/*
* udp_diag.c Module for monitoring UDP transport protocols sockets.
*
* Authors: Pavel Emelyanov, <xemul@parallels.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/inet_diag.h>
#include <linux/udp.h>
#include <net/udp.h>
#include <net/udplite.h>
#include <linux/sock_diag.h>
static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *req,
struct nlattr *bc, bool net_admin)
{
if (!inet_diag_bc_sk(bc, sk))
return 0;
return inet_sk_diag_fill(sk, NULL, skb, req,
sk_user_ns(NETLINK_CB(cb->skb).sk),
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh, net_admin);
}
static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
const struct nlmsghdr *nlh,
const struct inet_diag_req_v2 *req)
{
int err = -EINVAL;
struct sock *sk = NULL;
struct sk_buff *rep;
struct net *net = sock_net(in_skb->sk);
rcu_read_lock();
if (req->sdiag_family == AF_INET)
sk = __udp4_lib_lookup(net,
req->id.idiag_src[0], req->id.idiag_sport,
req->id.idiag_dst[0], req->id.idiag_dport,
req->id.idiag_if, 0, tbl, NULL);
#if IS_ENABLED(CONFIG_IPV6)
else if (req->sdiag_family == AF_INET6)
sk = __udp6_lib_lookup(net,
(struct in6_addr *)req->id.idiag_src,
req->id.idiag_sport,
(struct in6_addr *)req->id.idiag_dst,
req->id.idiag_dport,
req->id.idiag_if, 0, tbl, NULL);
#endif
if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
sk = NULL;
rcu_read_unlock();
err = -ENOENT;
if (!sk)
goto out_nosk;
err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
if (err)
goto out;
err = -ENOMEM;
rep = nlmsg_new(sizeof(struct inet_diag_msg) +
sizeof(struct inet_diag_meminfo) + 64,
GFP_KERNEL);
if (!rep)
goto out;
err = inet_sk_diag_fill(sk, NULL, rep, req,
sk_user_ns(NETLINK_CB(in_skb).sk),
NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, 0, nlh,
netlink_net_capable(in_skb, CAP_NET_ADMIN));
if (err < 0) {
WARN_ON(err == -EMSGSIZE);
kfree_skb(rep);
goto out;
}
err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
MSG_DONTWAIT);
if (err > 0)
err = 0;
out:
if (sk)
sock_put(sk);
out_nosk:
return err;
}
static void udp_dump(struct udp_table *table, struct sk_buff *skb,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *r, struct nlattr *bc)
{
bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
struct net *net = sock_net(skb->sk);
int num, s_num, slot, s_slot;
s_slot = cb->args[0];
num = s_num = cb->args[1];
for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
struct udp_hslot *hslot = &table->hash[slot];
struct sock *sk;
num = 0;
if (hlist_empty(&hslot->head))
continue;
spin_lock_bh(&hslot->lock);
sk_for_each(sk, &hslot->head) {
struct inet_sock *inet = inet_sk(sk);
if (!net_eq(sock_net(sk), net))
continue;
if (num < s_num)
goto next;
if (!(r->idiag_states & (1 << sk->sk_state)))
goto next;
if (r->sdiag_family != AF_UNSPEC &&
sk->sk_family != r->sdiag_family)
goto next;
if (r->id.idiag_sport != inet->inet_sport &&
r->id.idiag_sport)
goto next;
if (r->id.idiag_dport != inet->inet_dport &&
r->id.idiag_dport)
goto next;
if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) {
spin_unlock_bh(&hslot->lock);
goto done;
}
next:
num++;
}
spin_unlock_bh(&hslot->lock);
}
done:
cb->args[0] = slot;
cb->args[1] = num;
}
static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *r, struct nlattr *bc)
{
udp_dump(&udp_table, skb, cb, r, bc);
}
static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
const struct inet_diag_req_v2 *req)
{
return udp_dump_one(&udp_table, in_skb, nlh, req);
}
static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
void *info)
{
r->idiag_rqueue = sk_rmem_alloc_get(sk);
r->idiag_wqueue = sk_wmem_alloc_get(sk);
}
#ifdef CONFIG_INET_DIAG_DESTROY
static int __udp_diag_destroy(struct sk_buff *in_skb,
const struct inet_diag_req_v2 *req,
struct udp_table *tbl)
{
struct net *net = sock_net(in_skb->sk);
struct sock *sk;
int err;
rcu_read_lock();
if (req->sdiag_family == AF_INET)
sk = __udp4_lib_lookup(net,
req->id.idiag_dst[0], req->id.idiag_dport,
req->id.idiag_src[0], req->id.idiag_sport,
req->id.idiag_if, 0, tbl, NULL);
#if IS_ENABLED(CONFIG_IPV6)
else if (req->sdiag_family == AF_INET6) {
if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
sk = __udp4_lib_lookup(net,
req->id.idiag_dst[3], req->id.idiag_dport,
req->id.idiag_src[3], req->id.idiag_sport,
req->id.idiag_if, 0, tbl, NULL);
else
sk = __udp6_lib_lookup(net,
(struct in6_addr *)req->id.idiag_dst,
req->id.idiag_dport,
(struct in6_addr *)req->id.idiag_src,
req->id.idiag_sport,
req->id.idiag_if, 0, tbl, NULL);
}
#endif
else {
rcu_read_unlock();
return -EINVAL;
}
if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
sk = NULL;
rcu_read_unlock();
if (!sk)
return -ENOENT;
if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
sock_put(sk);
return -ENOENT;
}
err = sock_diag_destroy(sk, ECONNABORTED);
sock_put(sk);
return err;
}
static int udp_diag_destroy(struct sk_buff *in_skb,
const struct inet_diag_req_v2 *req)
{
return __udp_diag_destroy(in_skb, req, &udp_table);
}
static int udplite_diag_destroy(struct sk_buff *in_skb,
const struct inet_diag_req_v2 *req)
{
return __udp_diag_destroy(in_skb, req, &udplite_table);
}
#endif
static const struct inet_diag_handler udp_diag_handler = {
.dump = udp_diag_dump,
.dump_one = udp_diag_dump_one,
.idiag_get_info = udp_diag_get_info,
.idiag_type = IPPROTO_UDP,
.idiag_info_size = 0,
#ifdef CONFIG_INET_DIAG_DESTROY
.destroy = udp_diag_destroy,
#endif
};
static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *r,
struct nlattr *bc)
{
udp_dump(&udplite_table, skb, cb, r, bc);
}
static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
const struct inet_diag_req_v2 *req)
{
return udp_dump_one(&udplite_table, in_skb, nlh, req);
}
static const struct inet_diag_handler udplite_diag_handler = {
.dump = udplite_diag_dump,
.dump_one = udplite_diag_dump_one,
.idiag_get_info = udp_diag_get_info,
.idiag_type = IPPROTO_UDPLITE,
.idiag_info_size = 0,
#ifdef CONFIG_INET_DIAG_DESTROY
.destroy = udplite_diag_destroy,
#endif
};
static int __init udp_diag_init(void)
{
int err;
err = inet_diag_register(&udp_diag_handler);
if (err)
goto out;
err = inet_diag_register(&udplite_diag_handler);
if (err)
goto out_lite;
out:
return err;
out_lite:
inet_diag_unregister(&udp_diag_handler);
goto out;
}
static void __exit udp_diag_exit(void)
{
inet_diag_unregister(&udplite_diag_handler);
inet_diag_unregister(&udp_diag_handler);
}
module_init(udp_diag_init);
module_exit(udp_diag_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);
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